Well, it got done and I’m happy about it. It took two more sessions and involved more measuring (the room is not quite plumb) and difficulty attaching the wires to the screws, which were snug against the housing. I ended up doing a cheat–a short length of lamp wire, softer and more maneuverable. Still difficult for me, but done, January 2.
The fun part was playing with position and beam direction of the three light fixtures. I may add a fourth sometime. Yes, this worked out great!